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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28e8d463b56dce5a02728d5cb1fc3b02d691a09522d5a917b5abb9bb65cb322c' 
  AND token = 'iXEMWRLg4+B9yuMdac+2aCgc/J3biu42Ls9QsrvomYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}